From 29e2def59d42db61d67076a67e263038dc43f9a7 Mon Sep 17 00:00:00 2001
From: Igor Opaniuk <igor.opaniuk@toradex.com>
Date: Wed, 29 May 2019 13:00:42 +0300
Subject: [PATCH] apalis_imx6: use UUID for rootfs

1. Replace usage of "/dev/mmcblk*p*" with a proper UUID of rootfs
partition. This fixes the issue, when MMC controllers are probed in
a different order in U-boot and Linux kernel.
2. Fix legacy USB command (both sdboot and usbboot can be used now).

Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
---
 include/configs/apalis_imx6.h | 64 +++++++++++++++++++++++------------
 1 file changed, 43 insertions(+), 21 deletions(-)

diff --git a/include/configs/apalis_imx6.h b/include/configs/apalis_imx6.h
index c27ba6ca6b..54094e495a 100644
--- a/include/configs/apalis_imx6.h
+++ b/include/configs/apalis_imx6.h
@@ -123,16 +123,21 @@
 	"imx6q-apalis-cam-eval.dtb fat 0 1"
 
 #define EMMC_BOOTCMD \
-	"emmcargs=ip=off root=/dev/mmcblk0p2 rw,noatime rootfstype=ext4 " \
-		"rootwait\0" \
-	"emmcboot=run setup; " \
+	"set_emmcargs emmcargs ip=off root=PARTUUID=${uuid} ro,noatime " \
+		"rootfstype=ext4 rootwait\0" \
+	"emmcboot=run setup; run emmcfinduuid; run set_emmcargs; " \
 		"setenv bootargs ${defargs} ${emmcargs} ${setupargs} " \
 		"${vidargs}; echo Booting from internal eMMC chip...; "	\
-		"run emmcdtbload; load mmc 0:1 ${kernel_addr_r} " \
-		"${boot_file} && run fdt_fixup && " \
+		"run emmcdtbload; load mmc ${emmcdev}:${emmcbootpart} " \
+		"${kernel_addr_r} ${boot_file} && run fdt_fixup && " \
 		"bootz ${kernel_addr_r} ${dtbparam}\0" \
-	"emmcdtbload=setenv dtbparam; load mmc 0:1 ${fdt_addr_r} " \
-		"${fdt_file} && setenv dtbparam \" - ${fdt_addr_r}\" && true\0"
+	"emmcbootpart=1\0" \
+	"emmcdev=0\0" \
+	"emmcdtbload=setenv dtbparam; load mmc ${emmcdev}:${emmcbootpart} " \
+		"${fdt_addr_r} ${fdt_file} && " \
+		"setenv dtbparam \" - ${fdt_addr_r}\" && true\0" \
+	"emmcfinduuid=part uuid mmc ${mmcdev}:${emmcrootpart} uuid\0" \
+	"emmcrootpart=2\0"
 
 #define MEM_LAYOUT_ENV_SETTINGS \
 	"bootm_size=0x20000000\0" \
@@ -145,7 +150,7 @@
 	"scriptaddr=0x17000000\0"
 
 #define NFS_BOOTCMD \
-	"nfsargs=ip=:::::eth0:on root=/dev/nfs rw\0" \
+	"nfsargs=ip=:::::eth0:on root=/dev/nfs ro\0" \
 	"nfsboot=run setup; " \
 		"setenv bootargs ${defargs} ${nfsargs} ${setupargs} " \
 		"${vidargs}; echo Booting via DHCP/TFTP/NFS...; " \
@@ -155,27 +160,43 @@
 		"&& setenv dtbparam \" - ${fdt_addr_r}\" && true\0"
 
 #define SD_BOOTCMD \
-	"sdargs=ip=off root=/dev/mmcblk1p2 rw,noatime rootfstype=ext4 " \
-		"rootwait\0" \
-	"sdboot=run setup; " \
+	"set_sdargs=setenv sdargs ip=off root=PARTUUID=${uuid} ro,noatime " \
+		"rootfstype=ext4 rootwait\0" \
+	"sdboot=run setup; run sdfinduuid; run set_sdargs; " \
 		"setenv bootargs ${defargs} ${sdargs} ${setupargs} " \
 		"${vidargs}; echo Booting from SD card; " \
-		"run sddtbload; load mmc 1:1 ${kernel_addr_r} " \
-		"${boot_file} && run fdt_fixup && " \
+		"run sddtbload; load mmc ${sddev}:${sdbootpart} " \
+		"${kernel_addr_r} ${boot_file} && run fdt_fixup && " \
 		"bootz ${kernel_addr_r} ${dtbparam}\0" \
-	"sddtbload=setenv dtbparam; load mmc 1:1 ${fdt_addr_r} " \
-		"${fdt_file} && setenv dtbparam \" - ${fdt_addr_r}\" && true\0"
+	"sdbootpart=1\0" \
+	"sddev=1\0" \
+	"sddtbload=setenv dtbparam; load mmc ${sddev}:${sdbootpart} " \
+		"${fdt_addr_r} " \
+		"${fdt_file} && setenv dtbparam \" - " \
+		"${fdt_addr_r}\" && true\0" \
+	"sdfinduuid=part uuid mmc ${sddev}:${sdrootpart} uuid\0" \
+	"sdrootpart=2\0"
+
 
 #define USB_BOOTCMD \
-	"usbargs=ip=off root=/dev/sda2 rw,noatime rootfstype=ext4 " \
-		"rootwait\0" \
-	"usbboot=run setup; setenv bootargs ${defargs} ${setupargs} " \
+	"set_usbargs=setenv usbargs ip=off root=PARTUUID=${uuid} ro,noatime " \
+		"rootfstype=ext4 rootwait\0" \
+	"usbboot=run setup; usb start; run usbfinduuid; run set_usbargs; " \
+		"setenv bootargs ${defargs} ${setupargs} " \
 		"${usbargs} ${vidargs}; echo Booting from USB stick...; " \
-		"usb start && run usbdtbload; load usb 0:1 ${kernel_addr_r} " \
+		"run usbdtbload; load usb " \
+		"${usbdev}:${usbbootpart} ${kernel_addr_r} " \
 		"${boot_file} && run fdt_fixup && " \
 		"bootz ${kernel_addr_r} ${dtbparam}\0" \
-	"usbdtbload=setenv dtbparam; load usb 0:1 ${fdt_addr_r} " \
-		"${fdt_file} && setenv dtbparam \" - ${fdt_addr_r}\" && true\0"
+	"usbbootpart=1\0" \
+	"usbdev=0\0" \
+	"usbdtbload=setenv dtbparam; load usb ${usbdev}:${usbbootpart} "\
+		"${fdt_addr_r} " \
+		"${fdt_file} && setenv dtbparam \" - " \
+		"${fdt_addr_r}\" && true\0" \
+	"usbfinduuid=part uuid usb ${usbdev}:${usbrootpart} uuid\0" \
+	"usbrootpart=2\0"
+
 
 #ifndef CONFIG_TDX_APALIS_IMX6_V1_0
 #define FDT_FILE "imx6q-apalis-eval.dtb"
@@ -199,6 +220,7 @@
 	MEM_LAYOUT_ENV_SETTINGS \
 	NFS_BOOTCMD \
 	SD_BOOTCMD \
+	USB_BOOTCMD \
 	"setethupdate=if env exists ethaddr; then; else setenv ethaddr " \
 		"00:14:2d:00:00:00; fi; tftpboot ${loadaddr} " \
 		"flash_eth.img && source ${loadaddr}\0" \
-- 
2.25.1